#5B91DE
Closest named color: Dark Sky Blue (#448EE4). oklch(65.3% 0.129 257.4), rgb(91, 145, 222).
Aa
Black text reads best on this color (6.54:1).
About this color
#5B91DE is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.129 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.025 away. Black text reads best on it, at 6.54:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.54:1 |
| White text | 3.20:1 |
Values
| HEX | #5B91DE |
| RGB | rgb(91, 145, 222) |
| HSL | hsl(215, 66%, 61%) |
| OKLCH | oklch(65.3% 0.129 257.4) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #5B91DE | 3.20:1 | AA large text | Lc -64.5 | Content text, not long reading |
| Black text on #5B91DE | 6.54:1 | AA | Lc 45.0 | Non-text elements, placeholder text |
| #5B91DE text on white | 3.20:1 | AA large text | Lc 59.1 | Large or bold text, headings |
| #5B91DE text on black | 6.54:1 | AA | Lc -42.6 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 500.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CBDAF1
oklch(88.4% 0.036 258.9)
-
Step 300
300
#A7C3EA
oklch(81% 0.063 256.7)
-
Step 400
400
#78A2DF
oklch(70.6% 0.101 257.6)
-
Step 500
500 (this color)
#5B91DE
oklch(65.3% 0.129 257.4)
-
Step 600
600
#3872C4
oklch(55.5% 0.141 257.5)
-
Step 700
700
#2B60A9
oklch(49.2% 0.13 257.2)
-
Step 800
800
#254E89
oklch(42.6% 0.108 257.8)
-
Step 900
900
#23426E
oklch(37.9% 0.084 257.4)
-
Step 950
950
#152740
oklch(27.1% 0.053 256.9)
#5B91DE with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #7196E1 | 0.029 |
| Deuteranopia (no green cones) | #5F8ADC | 0.018 |
| Tritanopia (no blue cones) | #00A2AD | 0.110 |
| Achromatopsia (no color) | #909090 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B91DE
#5B91DE
oklch(65.3% 0.129 257.4)
- #BC841A
#BC841A
oklch(65.3% 0.13 76.9)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #5B91DE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.025
- Cornflower Blue #6495ED ΔE 0.026
- Chefchaouen Blue #4895EF ΔE 0.028
- Soft Blue #6488EA ΔE 0.034
- Faded Blue #658CBB ΔE 0.052
- Dodger Blue #1E90FF ΔE 0.062
- Water Blue #0E87CC ΔE 0.066
- Perrywinkle #8F8CE7 ΔE 0.066
Use #5B91DE in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.